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LibWeb: Add new code generator for creating exposed interface helpers
This new code generator takes all the .idl files in LibWeb, looks for each top level interface in there with an [Exposed=Foo] attribute, and adds code to add the constructor and prototype for each of those exposed interfaces to the realm of the relevant global object we're initialzing. It will soon replace WindowObjectHelper as the way that web interfaces are added to the Window object, and will be used in the future for creating proper WorkerGlobalScope objects for dedicated and shared workers.
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/*
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* Copyright (c) 2022, Andrew Kaster <akaster@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Debug.h>
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#include <AK/LexicalPath.h>
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#include <AK/SourceGenerator.h>
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#include <AK/String.h>
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#include <AK/StringBuilder.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/Stream.h>
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#include <LibIDL/IDLParser.h>
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#include <LibIDL/Types.h>
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#include <LibMain/Main.h>
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static ErrorOr<void> add_to_interface_sets(IDL::Interface&, Vector<IDL::Interface&>& window_exposed, Vector<IDL::Interface&>& dedicated_worker_exposed, Vector<IDL::Interface&>& shared_worker_exposed);
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static String s_error_string;
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static ErrorOr<void> generate_exposed_interface_header(StringView class_name, StringView output_path)
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{
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StringBuilder builder;
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SourceGenerator generator(builder);
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generator.set("global_object_snake_name", String(class_name).to_snakecase());
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generator.append(R"~~~(
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#pragma once
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#include <LibJS/Forward.h>
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namespace Web::Bindings {
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void add_@global_object_snake_name@_exposed_interfaces(JS::Object&, JS::Realm&);
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}
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)~~~");
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auto generated_header_path = LexicalPath(output_path).append(String::formatted("{}ExposedInterfaces.h", class_name)).string();
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auto generated_header_file = TRY(Core::Stream::File::open(generated_header_path, Core::Stream::OpenMode::Write));
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TRY(generated_header_file->write(generator.as_string_view().bytes()));
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return {};
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}
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static ErrorOr<void> generate_exposed_interface_implementation(StringView class_name, StringView output_path, Vector<IDL::Interface&>& exposed_interfaces)
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{
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StringBuilder builder;
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SourceGenerator generator(builder);
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generator.set("global_object_name", class_name);
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generator.set("global_object_snake_name", String(class_name).to_snakecase());
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generator.append(R"~~~(
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#include <LibJS/Runtime/Object.h>
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#include <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/Bindings/@global_object_name@ExposedInterfaces.h>
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)~~~");
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for (auto& interface : exposed_interfaces) {
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auto gen = generator.fork();
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gen.set("prototype_class", interface.prototype_class);
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gen.set("constructor_class", interface.constructor_class);
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gen.append(R"~~~(#include <LibWeb/Bindings/@constructor_class@.h>
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)~~~");
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if (interface.parent_name != "[Synthetic Interface]"sv)
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gen.append(R"~~~(#include <LibWeb/Bindings/@prototype_class@.h>
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)~~~");
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}
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// FIXME: Special case window. We should convert Window, Location, and Navigator to use IDL
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if (class_name == "Window"sv) {
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generator.append(R"~~~(#include <LibWeb/Bindings/WindowConstructor.h>
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#include <LibWeb/Bindings/WindowPrototype.h>
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#include <LibWeb/Bindings/LocationConstructor.h>
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#include <LibWeb/Bindings/LocationPrototype.h>
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#include <LibWeb/Bindings/NavigatorConstructor.h>
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#include <LibWeb/Bindings/NavigatorPrototype.h>
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)~~~");
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}
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generator.append(R"~~~(
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namespace Web::Bindings {
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void add_@global_object_snake_name@_exposed_interfaces(JS::Object& global, JS::Realm& realm)
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{
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auto& vm = global.vm();
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// FIXME: Should we use vm.current_realm() here?
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)~~~");
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auto add_interface = [](SourceGenerator& gen, StringView name, StringView prototype_class, StringView constructor_class) {
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gen.set("interface_name", name);
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gen.set("prototype_class", prototype_class);
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gen.set("constructor_class", constructor_class);
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gen.append(R"~~~( {
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auto& prototype = Bindings::ensure_web_prototype<Bindings::@prototype_class@>(realm, "@interface_name@");
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auto& constructor = Bindings::ensure_web_constructor<Bindings::@constructor_class@>(realm, "@interface_name@");
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global.define_direct_property("@interface_name@", &constructor, JS::Attribute::Writable | JS::Attribute::Configurable);
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prototype.define_direct_property(vm.names.constructor, &constructor, JS::Attribute::Writable | JS::Attribute::Configurable);
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constructor.define_direct_property(vm.names.name, js_string(vm, "@interface_name@"), JS::Attribute::Configurable);
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}
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)~~~"); };
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for (auto& interface : exposed_interfaces) {
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auto gen = generator.fork();
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add_interface(gen, interface.name, interface.prototype_class, interface.constructor_class);
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}
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// FIXME: Special case window. We should convert Window, Location, and Navigator to use IDL
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if (class_name == "Window"sv) {
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auto gen = generator.fork();
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add_interface(gen, "Window"sv, "WindowPrototype"sv, "WindowConstructor"sv);
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add_interface(gen, "Location"sv, "LocationPrototype"sv, "LocationConstructor"sv);
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add_interface(gen, "Navigator"sv, "NavigatorPrototype"sv, "NavigatorConstructor"sv);
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}
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generator.append(R"~~~(
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}
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}
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)~~~");
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auto generated_implementation_path = LexicalPath(output_path).append(String::formatted("{}ExposedInterfaces.cpp", class_name)).string();
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auto generated_implementation_file = TRY(Core::Stream::File::open(generated_implementation_path, Core::Stream::OpenMode::Write));
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TRY(generated_implementation_file->write(generator.as_string_view().bytes()));
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return {};
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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Core::ArgsParser args_parser;
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StringView output_path;
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StringView base_path;
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Vector<String> paths;
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args_parser.add_option(output_path, "Path to output generated files into", "output-path", 'o', "output-path");
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args_parser.add_option(base_path, "Path to root of IDL file tree", "base-path", 'b', "base-path");
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args_parser.add_positional_argument(paths, "Paths of every IDL file that could be Exposed", "paths");
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args_parser.parse(arguments);
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VERIFY(!paths.is_empty());
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VERIFY(!base_path.is_empty());
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const LexicalPath lexical_base(base_path);
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// Read in all IDL files, we must own the storage for all of these for the lifetime of the program
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Vector<String> file_contents;
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for (String const& path : paths) {
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auto file_or_error = Core::Stream::File::open(path, Core::Stream::OpenMode::Read);
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if (file_or_error.is_error()) {
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s_error_string = String::formatted("Unable to open file {}", path);
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return Error::from_string_view(s_error_string);
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}
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auto file = file_or_error.release_value();
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auto string = MUST(file->read_all());
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file_contents.append(String(ReadonlyBytes(string)));
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}
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VERIFY(paths.size() == file_contents.size());
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Vector<IDL::Parser> parsers;
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Vector<IDL::Interface&> window_exposed;
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Vector<IDL::Interface&> dedicated_worker_exposed;
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Vector<IDL::Interface&> shared_worker_exposed;
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// TODO: service_worker_exposed
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for (size_t i = 0; i < paths.size(); ++i) {
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IDL::Parser parser(paths[i], file_contents[i], lexical_base.string());
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TRY(add_to_interface_sets(parser.parse(), window_exposed, dedicated_worker_exposed, shared_worker_exposed));
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parsers.append(move(parser));
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}
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TRY(generate_exposed_interface_header("Window"sv, output_path));
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TRY(generate_exposed_interface_header("DedicatedWorker"sv, output_path));
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TRY(generate_exposed_interface_header("SharedWorker"sv, output_path));
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// TODO: ServiceWorkerExposed.h
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TRY(generate_exposed_interface_implementation("Window"sv, output_path, window_exposed));
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TRY(generate_exposed_interface_implementation("DedicatedWorker"sv, output_path, dedicated_worker_exposed));
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TRY(generate_exposed_interface_implementation("SharedWorker"sv, output_path, shared_worker_exposed));
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// TODO: ServiceWorkerExposed.cpp
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return 0;
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}
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static void consume_whitespace(GenericLexer& lexer)
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{
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bool consumed = true;
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while (consumed) {
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consumed = lexer.consume_while(is_ascii_space).length() > 0;
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if (lexer.consume_specific("//")) {
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lexer.consume_until('\n');
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lexer.ignore();
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consumed = true;
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}
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}
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}
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enum ExposedTo {
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Nobody = 0x0,
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DedicatedWorker = 0x1,
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SharedWorker = 0x2,
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ServiceWorker = 0x4,
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AudioWorklet = 0x8,
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Window = 0x10,
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AllWorkers = 0xF, // FIXME: Is "AudioWorklet" a Worker? We'll assume it is for now
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All = 0x1F,
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};
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AK_ENUM_BITWISE_OPERATORS(ExposedTo);
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static ErrorOr<ExposedTo> parse_exposure_set(IDL::Interface& interface)
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{
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// NOTE: This roughly follows the definitions of https://webidl.spec.whatwg.org/#Exposed
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// It does not remotely interpret all the abstract operations therein though.
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auto maybe_exposed = interface.extended_attributes.get("Exposed");
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if (!maybe_exposed.has_value()) {
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s_error_string = String::formatted("Interface {} is missing extended attribute Exposed", interface.name);
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return Error::from_string_view(s_error_string);
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}
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auto exposed = maybe_exposed.value().trim_whitespace();
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if (exposed == "*"sv)
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return ExposedTo::All;
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if (exposed == "Window"sv)
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return ExposedTo::Window;
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if (exposed == "Worker"sv)
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return ExposedTo::AllWorkers;
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if (exposed == "AudioWorklet"sv)
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return ExposedTo::AudioWorklet;
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if (exposed[0] == '(') {
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ExposedTo whom = Nobody;
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for (StringView candidate : exposed.substring_view(1, exposed.length() - 1).split_view(',')) {
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candidate = candidate.trim_whitespace();
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if (candidate == "Window"sv) {
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whom |= ExposedTo::Window;
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} else if (candidate == "Worker"sv) {
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whom |= ExposedTo::AllWorkers;
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} else if (candidate == "DedicatedWorker"sv) {
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whom |= ExposedTo::DedicatedWorker;
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} else if (candidate == "SharedWorker"sv) {
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whom |= ExposedTo::SharedWorker;
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} else if (candidate == "ServiceWorker"sv) {
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whom |= ExposedTo::ServiceWorker;
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} else if (candidate == "AudioWorklet"sv) {
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whom |= ExposedTo::AudioWorklet;
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} else {
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s_error_string = String::formatted("Unknown Exposed attribute candidate {} in {} in {}", candidate, exposed, interface.name);
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return Error::from_string_view(s_error_string);
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}
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}
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if (whom == ExposedTo::Nobody) {
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s_error_string = String::formatted("Unknown Exposed attribute {} in {}", exposed, interface.name);
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return Error::from_string_view(s_error_string);
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}
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return whom;
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}
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s_error_string = String::formatted("Unknown Exposed attribute {} in {}", exposed, interface.name);
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return Error::from_string_view(s_error_string);
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}
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static IDL::Interface& add_synthetic_interface(IDL::Interface& reference_interface)
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{
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static Vector<NonnullOwnPtr<IDL::Interface>> s_synthetic_interfaces;
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GenericLexer function_lexer(reference_interface.extended_attributes.get("LegacyFactoryFunction").value());
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consume_whitespace(function_lexer);
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auto name = function_lexer.consume_until([](auto ch) { return is_ascii_space(ch) || ch == '('; });
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auto new_interface = make<IDL::Interface>();
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new_interface->name = name;
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new_interface->constructor_class = String::formatted("{}Constructor", new_interface->name);
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new_interface->prototype_class = reference_interface.prototype_class;
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new_interface->parent_name = "[Synthetic Interface]";
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s_synthetic_interfaces.append(move(new_interface));
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return *s_synthetic_interfaces.last();
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}
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ErrorOr<void> add_to_interface_sets(IDL::Interface& interface, Vector<IDL::Interface&>& window_exposed, Vector<IDL::Interface&>& dedicated_worker_exposed, Vector<IDL::Interface&>& shared_worker_exposed)
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{
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// TODO: Add service worker exposed and audio worklet exposed
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auto whom = TRY(parse_exposure_set(interface));
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VERIFY(whom != ExposedTo::Nobody);
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if (whom & ExposedTo::Window)
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window_exposed.append(interface);
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if (whom & ExposedTo::DedicatedWorker)
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dedicated_worker_exposed.append(interface);
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if (whom & ExposedTo::SharedWorker)
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shared_worker_exposed.append(interface);
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if (interface.extended_attributes.contains("LegacyFactoryFunction")) {
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auto& synthetic_interface = add_synthetic_interface(interface);
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if (whom & ExposedTo::Window)
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window_exposed.append(synthetic_interface);
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if (whom & ExposedTo::DedicatedWorker)
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dedicated_worker_exposed.append(synthetic_interface);
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if (whom & ExposedTo::SharedWorker)
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shared_worker_exposed.append(synthetic_interface);
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}
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return {};
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}
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